Ouk Sub Lee*, HyeBin Choi, HongMin Kim
The Journal of Mechanical Science and Technology, vol. 25, no. 1, pp.143-148, 2011

Abstract : This paper investigates the dynamic deformation behavior of two aluminum alloys, 2024-T4 and 6061-T6, using a modified split Hopkinson pressure bar (SHPB) with a pulse shaper technique at both elevated and room temperatures. An experimental strategy is proposed, and the dynamic deformation behaviors of two alloys are evaluated with the modified high-temperature SHPB apparatus. The experiments were carried out under varying strain rates and temperatures. The reflected waves modulated by the pulse shaper, the flow stressstrain relationships, the strain rates, the front- and back-ends stresses during the dynamic deformation period were measured at varying high temperatures. Experimentally obtained data were used to evaluate the parameters in the material constitutive equation, such as the Johnson-Cook (JC) constitutive model.

Keyword : m-SHPB (modified split Hopkinson pressure bar); Dynamic deformation behavior; Johnson-cook constitutive model; Flow stress; High strain rate; High temperature; Pulse shaper; Aluminum alloys